Beneficial role of carbon black on the properties of TiC ceramics

Nguyen, Van‐Huy; Pazhouhanfar, Yaghoub; Delbari, Seyed Ali; Shaddel, Shahrzad; Babapoor, Aziz; Mohammadpourderakhshi, Yasaman; Le, Quyet Van; Shokouhimehr, Mohammadreza; Asl, Mehdi Shahedi; Namini, Abbas Sabahi

doi:10.1016/j.ceramint.2020.06.125

Cited by 38 publications

(10 citation statements)

References 84 publications

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“…The higher strengths in the present study are attributed to the higher relative density of the ceramics in this study (~99%) compared to relative densities of 95% or lower for other studies. Comparisons of room temperature strengths of carbide ceramics, in Figure 4, indicated that (Hf 0.2 ,Zr 0.2 ,Ti 0.2 ,Ta 0.2 ,Nb 0.2 )C ceramics had a higher flexural strength than most binary 23 or individual carbide 27,28,31 ceramics with the exception of TiC 30 ceramics. The enhancement of flexural strength of HEC ceramics compared to the individual carbides may be due the refined microstructure and higher (~99%) relative density of the ceramics in the present study in addition to mass disorder and SS hardening effects mentioned in other studies 6,19–21 …”

Section: Resultsmentioning

confidence: 99%

Strength of single‐phase high‐entropy carbide ceramics up to 2300°C

et al. 2020

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The mechanical properties of single-phase (Hf,Zr,Ti,Ta,Nb)C high-entropy carbide (HEC) ceramics were investigated. Ceramics with relative density >99% and an average grain size of 0.9 ± 0.3 µm were produced by a two-step process that involved carbothermal reduction at 1600°C and hot pressing at 1900°C. At room temperature, Vickers hardness was 25.0 ± 1.0 GPa at a load of 4.9 N, Young's modulus was 450 GPa, chevron notch fracture toughness was 3.5 ± 0.3 MPa•m 1/2 , and four-point flexural strength was 421 ± 27 MPa. With increasing temperature, flexural strength stayed above ~400 MPa up to 1800°C, then decreased nearly linearly to 318 ± 21 MPa at 2000°C and to 93 ± 10 MPa at 2300°C. No significant changes in relative density or average grain size were noted after testing at elevated temperatures. The degradation of flexural strength above 1800°C was attributed to a decrease in dislocation density that was accompanied by an increase in dislocation motion. These are the first reported flexural strengths of HEC ceramics at elevated temperatures. K E Y W O R D S dislocation, high-entropy carbides, high-temperature flexural strength, mechanical properties, microstructure How to cite this article: Feng L, Chen W-T, Fahrenholtz WG, Hilmas GE. Strength of single-phase high-entropy carbide ceramics up to 2300°C.

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Section: Resultsmentioning

confidence: 99%

Strength of single‐phase high‐entropy carbide ceramics up to 2300°C

et al. 2020

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“…3 compares the polished sections of the titanium carbide-based ceramics produced in this research work. According to the EDS results [28], the microstructure of the undoped TiC (Fig. 3a) is composed of a TiC/TiC x matrix in which graphite is deposited.…”

Section: Microstructure Assessmentmentioning

confidence: 99%

“…Although the hardness of the TiC-graphite specimen showed a noticeable drop compared to the monolithic TiC, the bending strength of the ceramic composite was considerably improved, standing next to 630 MPa. The influence of carbon black on the sinterability of titanium carbide was found to be impressive so that a fully dense part was achieved by incorporating carbon black (5 wt%) to titanium carbide [28]. In addition, the carbon black incorporation could noticeably refine the microstructure of the matrix.…”

Section: Introductionmentioning

confidence: 98%

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Jafargholinejad

Soheyl

2021

Synth. Sinter.

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Five carbonaceous nano-additives (graphite, graphene, carbon black, carbon nanotubes, and diamond) had different impacts on the sinterability, microstructural evolution, and properties of titanium carbide. In this research, the sintering by spark plasma was employed to produce the monolithic TiC and carbon-doped ceramics under the sintering parameters of 1900 ºC, 10 min, 40 MPa. The carbon black additive had the best performance in densifying the TiC, thanks to its fine particle size, as well as its high chemical reactivity with TiO2 surface oxide. By contrast, the incorporation of nano-diamonds resulted in a considerable decline in the relative density of TiC owing to the graphitization phenomenon, together with the gas production at high temperatures. Although carbon precipitation from the TiC matrix occurred in all samples, some of the added carbonaceous phases promoted this phenomenon, while the others hindered it to some extent. Amongst the introduced additives, carbon black had the most contribution to grain refining, so that a roughly halved average grain size was attained in comparison with the undoped specimen. The highest values of hardness (3233 HV0.1 kg), thermal conductivity (25.1 W/mK), and flexural strength (658 MPa) secured for the ceramic incorporated by 5 wt% nano carbon black.

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“…The most important additives used in solid state sinter are carbon and boron. [21][22][23][24][25][26][27][28][29][30][31][32][33] The main role of carbon is to remove SiO 2 from the surface of SiC granules. [21][22][23] This trend is because of the revival of SiO 2 at temperatures below 1400°C.…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons, it is necessary to obtain sinter assistance to improve the condition of the sintering. The most important additives used in solid state sinter are carbon and boron 21‐33 . The main role of carbon is to remove SiO 2 from the surface of SiC granules 21‐23 .…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of SiC‐C‐B₄C composites with different carbon additives produced by pressureless sintering

Kozekanan

Moradkhani

Baharvandi

et al. 2021

Int J Applied Ceramic Tech

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In this research, carbon sources (Resin Phenolic, Carbon Black and Graphite) and Boron Carbide (B 4 C) were used to improve the mechanical properties of Silicon Carbide (SiC) composite. For this purpose, carbon sources of 0.5, 0.75, 1, 1.5, 2, 2.5, 3, and 5 wt% as well as 0.5 wt% B 4 C were added to SiC powder, respectively.The sample containing SiC-2.5 wt% Resin Phenolic-0.5 wt% B 4 C had the best properties with relative density, hardness, and fracture toughness values of 98.5%, 2820 GPa, and 3.9 MPa.√m, respectively. Examination of SEM images showed that by increasing carbon from 0.5 to 2.5 wt%, the fracture changes from intergranular to transgranular.

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Beneficial role of carbon black on the properties of TiC ceramics

Cited by 38 publications

References 84 publications

Strength of single‐phase high‐entropy carbide ceramics up to 2300°C

Strength of single‐phase high‐entropy carbide ceramics up to 2300°C

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Mechanical properties of SiC‐C‐B₄C composites with different carbon additives produced by pressureless sintering

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Beneficial role of carbon black on the properties of TiC ceramics

Cited by 38 publications

References 84 publications

Strength of single‐phase high‐entropy carbide ceramics up to 2300°C

Strength of single‐phase high‐entropy carbide ceramics up to 2300°C

Effects of carbon nano-additives on characteristics of TiC ceramics prepared by field-assisted sintering

Mechanical properties of SiC‐C‐B4C composites with different carbon additives produced by pressureless sintering

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Mechanical properties of SiC‐C‐B₄C composites with different carbon additives produced by pressureless sintering